In his social circle, Humphries has a reputation for sending silly emails, the Times said, and the shirtless photo was sent from an account he shares with his wife, who has a framed copy of it.

His supervisor at the FBI even posted it on a bulletin board at the office, the newspaper reported.

Kevin P. Casey/AP

FBI Special Agent Frederick Humphries speaks during a news conference in Seattle in 2005.

Previously known only as the “shirtless” FBI agent who helped jump start the investigation of former CIA Director David Petraeus, Humphries, 47, was identified by the New York Times on Wednesday.

Humphries and Kelley were chummy, and the Tampa socialite complained to him in June or July that she had received threatening emails from an anonymous email account warning her to stay away from the four-star general.

The FBI eventually traced the emails to Paula Broadwell, Petraeus’ foxy biographer, and blew the lid off the secret affair the two had carried on for several months while Petraeus was serving as spy chief.

Humphries, meanwhile, has not escaped the scandal unscathed.

Though he was not assigned to the case, he was said to have grown “obsessed” with the FBI’s investigation of the Kelley emails and allegedly tipped off members of Congress when he suspected the agency was dragging its feet on the case for political reasons.

His actions resulted in him being internally investigated and reprimanded by FBI brass, sources told the Seattle Times.

The scandal was headed to Capitol Hill on Friday, with Petraeus set to answer questions from the House and Senate Intelligence Committees about the fatal attacks on the U.S. Consulate in Benghazi, Libya on Sept. 11.

The Broadwell affair would not be ignored, lawmakers said.

“I’m sure that will come up,” said Rep. C.A. Ruppersberger of Maryland, the ranking Democrat on the House committee.